public function PHPVideoToolkit::flvStreamSeek in Video 7

Same name and namespace in other branches

1. 7.2 libraries/phpvideotoolkit/phpvideotoolkit.php5.php \PHPVideoToolkit::flvStreamSeek()

* Streams a FLV file from a given point. You can control bandwidth, cache and session options. * Inspired by xmoov-php * * - @link http://xmoov.com/ * - @author Eric Lorenzo Benjamin jr * @access public *

Parameters

integer $seek_pos The position in the file to seek to.: * @param array|boolean $bandwidth_options If a boolean value, false then no bandwidth limiting will take place. * If true then bandwidth limiting will take place with packet_size = 90 and packet_interval = 0.3. * If an array the following values are default packet_size = 90 and packet_interval = 0.3, you will also * have to set active = true, ie array('active'=>true, 'packet_size'=>90, 'packet_interval'=>0.3) * @param boolean $allow_cache If true the file will be allowed to cache in the browser, if false then it won't * @return boolean

See also

xmoov-php,

File

libraries/phpvideotoolkit/phpvideotoolkit.php5.php, line 1235

Class

PHPVideoToolkit

Code

public function flvStreamSeek($seek_pos = 0, $bandwidth_options = array(), $allow_cache = true) {

  // 			check for input file
  if (!$this->_input_file) {

    //				input file not valid
    return $this
      ->_raiseError('streamFLV_no_input');

    //<-			exits
  }

  // 			make the pos safe
  $seek_pos = intval($seek_pos);

  // 			absorb the bandwidth options
  $bandwidth_options = is_array($bandwidth_options) ? array_merge(array(
    'active' => false,
    'packet_size' => 90,
    'packet_interval' => 0.3,
  ), $bandwidth_options) : array(
    'active' => $bandwidth_options,
    'packet_size' => 90,
    'packet_interval' => 0.3,
  );

  // 			if this file is not allowed to be cached send cache headers for all browsers.
  if (!$allow_cache) {
    session_cache_limiter('nocache');
    header('Expires: Thu, 19 Nov 1981 08:52:00 GMT');
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
    header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
    header('Pragma: no-cache');
  }

  // 			open file
  $handle = fopen($this->_input_file, 'rb');
  $file_size = filesize($this->_input_file) - ($seek_pos > 0 ? $seek_pos + 1 : 0);

  // 			send the flv headers
  header('Content-Type: video/x-flv');
  header('Content-Disposition: attachment; filename="' . basename($this->_input_file) . '"');
  header('Content-Length: ' . $file_size);

  // 			flv format header
  if ($seek_pos != 0) {
    print 'FLV';
    print pack('C', 1);
    print pack('C', 1);
    print pack('N', 9);
    print pack('N', 9);
  }

  // 			seek to the required point
  if (fseek($handle, $seek_pos) === -1) {

    //				input file not valid
    return $this
      ->_raiseError('streamFLV_passed_eof');

    //<-			exits
  }

  // 			if bandwidth control is active then workout the options
  if ($bandwidth_options['active']) {
    $packet_interval = intval($bandwidth_options['packet_interval']);
    $packet_size = intval($bandwidth_options['packet_size']) * 1042;
  }

  // 			output the file
  while (!feof($handle)) {

    // 				limit the bandwidth
    if ($bandwidth_options['active'] && $packet_interval > 0) {

      // 					output the required packet
      $time_start = self::microtimeFloat();
      echo fread($handle, $packet_size);
      $time_stop = self::microtimeFloat();

      // 					delay the output
      $time_difference = $time_stop - $time_start;
      if ($time_difference < $packet_interval) {
        usleep($packet_interval * 1000000 - $time_difference * 1000000);
      }
    }
    else {
      echo fread($handle, $file_size);
    }
  }

  // 			close the file
  fclose($handle);
  return true;
}